0.3.0 - 2012-07-11
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 * Simplify API of the NonceCache class; it now provides a single method
   check_nonce() rather than separate is_fresh() and add_nonce() methods.


0.2.0 - 2012-06-01
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 * Fix a race condition bug in NonceCache.


0.1.0 - 2012-02-27
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 * Initial release.
